NonAcademic Positions:

U. S. Coast Guard

Stephen Decatur Manufacturing

Combustion Engineering

Academic Positions:

Assistant Professor, Mathematics, Wesleyan University, 1958–1961.
Research Associate, Rockefeller University, 1961–1962.
Associate Professor, Mathematics and Philosophy, University of Denver, 1962–1963.
Associate Professor, Philosophy, Wayne State University, 1963–1965.
Professor, Philosophy, University of Rochester, 1965–
Chair, Philosophy, 1969–1982.
Burbank Professor of Moral and Intellectual Philosophy, 1982–
Professor, Computer Science, 1986–
Associate College Dean of Graduate Studies, 1992 –94.
Visiting Research Scientist, Institute for Human and Machine Intelligence, fall 1999.
Research Scientist, Pace Eminent Scholar, Institute for Human and Machine Intelligence, Spring 2001—2006